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Metals
Special Issues
Modeling and Analysis of Residual Stress in Welded Joints
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Modeling and Analysis of Residual Stress in Welded Joints

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (15 September 2019) | Viewed by 8623

Special Issue Editor

Prof. Dr. Raffaele Sepe

E-Mail Website
Guest Editor
Department of Chemical, Materials and Production Engineering, University of Naples Federico II P.le V. Tecchio, 80 - 80125 Naples - Italy
Interests: Residual stresses in welding joint; Fatigue; Finite Element Method; Fracture Mechanics; Thermo-mechanical analysis

Special Issue Information

Dear Colleagues,

Fusion welding processes are widely employed in several industrial fields such as aerospace, shipbuilding, automotive and machinery. However, when structural connections are performed through welding techniques, a non-uniform temperature distribution affects the components. This distribution initially causes a rapid thermal expansion, followed by a thermal contraction in the weld and in the surrounding areas, thus generating inhomogeneous plastic deformations and residual stresses in the weldment when it is cooled.

The presence of residual stresses can reduce the performance of welded structures; in fact the residual stress distribution can be considered an initial stress of a welded structure and it should be combined with the stress distribution caused by the applied service loading. Moreover, tensile residual stresses can be a major source of cracking and fracture in welding, whereas compressive residual stresses in the base plate could reduce the buckling strength of structure members. However, evaluating the residual stress associated with a welded joint is extremely complicated. The difficulty in determining this stress is emphasized by the thermal transient, by the variation of the thermal and mechanical properties of the material with the temperature and by the non-linear heat loss. Therefore, it is necessary to know the magnitude and distribution of welding residual stress in order to facilitate the design and fabrication of welded structures.

Several experimental destructive and non-destructive techniques for directly measuring residual stress have been developed. However, it is impossible for any of these experimental techniques to obtain a complete distribution of the residual stress and of the distortion affecting a welded structure. Thus, computational methods play an indispensable role in resolving these complex problems.

The aim of this Special Issue is to collect original research articles as well as review articles that seek to address the modeling and analysis of residual stress in welded joints. The Special Issue will include theoretical, numerical, and experimental contributions describing original research results and innovative concepts that address the issues of residual stress in welded joints. The scope includes (but is not limited to): simulations of welding processes, effects of residual stress on the fatigue behaviour of welded joints, thermo-mechanical analyses of welded joints, the modeling of residual stress relief in welded joints, modeling of pre-heat treatment and post-heat treatment and their effects on residual stress in welded joints.

Prof. Dr. Raffaele Sepe
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • residual stress
  • welding
  • finite element method
  • thermo-mechanical analysis
  • fatigue
  • fracture
  • heat treatment

Published Papers (2 papers)

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Research

16 pages, 18108 KiB  
Article
Evaluation of Heat Sources for the Simulation of the Temperature Distribution in Gas Metal Arc Welded Joints
by Andrea Chiocca, Francesco Frendo and Leonardo Bertini
Metals 2019, 9(11), 1142; https://doi.org/10.3390/met9111142 - 24 Oct 2019
Cited by 20 | Viewed by 4347
Abstract
Residual stresses can affect both the static strength and the fatigue endurance of welded joints. Residual stresses can be assessed by numerical simulation; however, the simulation of the welding process is a complex task that requires knowledge of several parameters, many of which [...] Read more.
Residual stresses can affect both the static strength and the fatigue endurance of welded joints. Residual stresses can be assessed by numerical simulation; however, the simulation of the welding process is a complex task that requires knowledge of several parameters, many of which can only be estimated with some uncertainty. The reduction in the number of these parameters can lead to a more feasible and efficient study. In this work, the finite element method is used to assess the capability of different thermal methods used to simulate a single pass of the gas metal arc welding process in reproducing the temperature distribution around the weld. Results of the simulations are compared to experimental measurements of the surface temperature close to the welding area. The thermal techniques analyzed adopt different levels of complexity, from the basic implementation of a constant initial temperature assigned to a given material volume, to the more comprehensive and widespread Goldak’s double-ellipsoid model. The study shows that, close to the weld seam, very similar thermal behaviors can be achieved by employing each one of the analyzed methods. Secondly, considering the constant initial temperature method, the comparison between experimental measurements and numerical simulations showed a fairly good agreement, suggesting that a relatively simple method (i.e., requiring the setting of only one parameter) can be used to efficiently reproduce the thermal history of a welding process. Full article
(This article belongs to the Special Issue Modeling and Analysis of Residual Stress in Welded Joints)
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14 pages, 5390 KiB  
Article
Fatigue Strength Enhancement of Butt Welds by Means of Shot Peening and Clean Blasting
by Jonas Hensel, Hamdollah Eslami, Thomas Nitschke-Pagel and Klaus Dilger
Metals 2019, 9(7), 744; https://doi.org/10.3390/met9070744 - 1 Jul 2019
Cited by 32 | Viewed by 3819
Abstract
Shot peening is a mechanical surface treatment to improve the fatigue strength of metallic components. Similarities exist between regular shot peening and conventional industrial clean blasting. However, the main difference between these two processes is the peening media used and the lack of [...] Read more.
Shot peening is a mechanical surface treatment to improve the fatigue strength of metallic components. Similarities exist between regular shot peening and conventional industrial clean blasting. However, the main difference between these two processes is the peening media used and the lack of control and documentation of peening parameters. The clean blasting process is not yet qualified to optimize fatigue enhancement, although it holds a similar potential to regular shot peening. Clean blasting is frequently applied to welded components, with the purpose of surface preparation for application of corrosion protection. This article presents the results of regular shot peened double V-groove (DV) butt welds made from construction steels S355N and S960QL, as well as the high strength aluminum alloy Al-6082. The peening parameters are varied widely. Furthermore, the effect of coverage and intensity is investigated to test the robustness of the peening processes. The data is completed with industrially clean blasted welds, representing typical workshop conditions. The overall objective of this work is to derive minimum peening parameters that still allow significant fatigue strength benefits. The presented data show a high robustness of the fatigue results to peening parameters. Full article
(This article belongs to the Special Issue Modeling and Analysis of Residual Stress in Welded Joints)
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